具有benzoxazole結構之無機液晶材料

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題名:	具有benzoxazole結構之無機液晶材料
作者:	江佩儀;Pei-yi Chiang
貢獻者:	化學研究所
關鍵詞:	液晶;liquid crystal
日期:	2005-06-24
上傳時間:	2009-09-22 10:11:56 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文主要分為兩個系列之合成與研究，所有的化合物經由1H-NMR、13C-NMR、Mass與元素分析以鑑定其結構與純度，液晶相性質則是利用偏光顯微鏡(POM)、熱差式掃描卡計儀(DSC)及Powder X-ray來觀察測量。系列一為合成化合物1；3-Alkoxy-6-[(4-alkoxy-2-hydroxy- phenylimino)- methyl]-benzene-1,2-diol及化合物2；2-Hydroxy-4- alkoxyl-N-(2-hydroxy-4- alkoxybenzylidene)anilines，探討側鏈基的數目以及碳鏈長短對液晶相的影響。化合物1的分子都具有SmC及SmA的液晶相，而化合物2的分子都具有SmC的液晶相。由於這兩個分子結構只差在一OH官能基，我們試著去解釋為什麼有這樣的排列變化，做了變溫IR的測量，而其實驗結果證實其化合物1具有分子間的氫鍵，而Powder X-ray的數據亦證實為層狀液晶的排列。系列二為合成出配位基2,3-dialkoxyl-6-(6-alkoxyl-benzooxazol- 2-yl)-phenol，所有的配位基都不具有液晶性質。接著，我們將配位基與鋅金屬進行配位，得到單金屬無機液晶，且為所預期的盤狀液晶。錯合物的澄清點皆比配位基提高約30~80 ℃。然而，當我們將配位基與金屬Cu和Pd進行錯合時，皆不具任何液晶相。由Powder X-ray的數據，我們得知錯合物的排列為Colr，其space group是為P21。 In this thesis, we report the synthesis, characterization and mesomorphic properties of two novel series of new mesogenic derivatives based on 3-Alkoxy-6-[(4-alkoxy-2-hydroxy-phenylimino)- methyl]-benzene-1,2-diol 1 and metal complexes of 2,3-dialkoxyl-6-(6- alkoxyl-benzooxazol-2-yl)-phenol. These compounds were all characterized by 1H-NMR and 13C-NMR spectroscopy, and their mesomorphic properties were studied by differential scanning calorimeter (DSC), polarized optical microscopy (POM) and powder XRD diffraction. For the first series of 3-Alkoxy-6-[(4-alkoxy-2-hydroxy-phenylimino) -methyl]-benzene-1,2-diol 1 and 2-Hydroxy-4- alkoxyl-N-(2-hydroxy-4- alkoxybenzylidene)anilines 2, all compounds exhibited smectic phases. Compounds 2 exhibited mesomorphic behavior similarly to compounds 1. In contrast, compounds 2 have higher melting points and wider mesogenic temperatures than 1. In the second series of derivatives; the compounds of 2,3-dialkoxyl -6-(6-alkoxyl-benzooxazol-2-yl)-phenol as ligands were not mesogenic. However, the zinc(Ⅱ) complexes exhibited columnar rectangular (Colr, P21) phases, as predicted for disc molecules. The melting point of zinc complexes is ca. 30~80 ℃ higher than their metal-free ligands. However, palladium(Ⅱ) and copper(Ⅱ) complexes were not mesogenic.
顯示於類別:	[化學研究所] 博碩士論文

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